Sawmill set-works.



No'. 692,297. Patented Feb. 4, |902.

M. F. JOHNSTON.

SAWMILL SET WORKS.

(Application led Sept. 29, 1900.)

(No Model.)

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P'frwnrea Feb. 4, |902.

- M. F. JOHNSTON.

SAWMILL SET WORKS.

(Application filed Sept. 29, 1900.) (No Model.) 2 Sheets-Sheetz 2.

UNifrnn STATES MOSES F. JOHNSTON, OF DUNBAR, WISCONSIN, ASSIGNOR OF ONE-HALF ITO PATENT OFFICE.

RALPH E. GIVESLER, OFDUNBAR, WISCONSIN.

SAWMILL Serf-Wenas.

SPECIFICATION forming part of Letters Patent No. 692,297, dated February 4, 1902 Application filed September 29, 1900.4 Serial No. 31,5719. (No model.)

y, vide means for cushioning the iuid-pressurelinea a of Fig. 1. verse sectional view through the duid-presactuated mechanism, deadening the concussion thereof, and preventing the set-works from being unduly jarred thereby.

-My invention consists in the peculiar coustruction and combination of devices hereil. after fully st forth,- and pointed out in the claims.

In the accompanying drawings, Figure 1 is top plan view of a sawmill-carriage provided withset-works embodying myinvention. Fig. 2 s a vertical longitudinal sectional View of the same, taken on a plane indicated by the Fig..3 is a detail transsur'e-actuated mechanism and the set-shaft.

Fig. 4 is a similar view through the cushion-V ing mechanism. Fig. 5 isa detail elevation of the adjusting-segment, theadjusting-lever, and the coacting adjusting-arm of the set-shaft. Fig. 6 is a detail sectional View aken on a plane indicated bythe line b b of The sawmill-carriage 1 may be of the usual or any preferred construction and operates on the usualV trackway 3'. The knees 4 operate on the head-blocks 5 andare provided on their undersides with rack-bars 6, as is usual, which rack-bars are engaged by pinions 7 on a shaft 8, said set-shaft having its bearings in the head-blocks, as shown. A rock-shaft 9 is journaled in a bearing 10, which is bolted on a longitudinally-disposed timber 11, with which the carriage is provided, and the said rockshaft also has its bearings in annular casings 12 13, which are also bolted on the said timber 11. The heads of the said casings through which the said rock-shaft extends are provided with stuing-bokes, (indicated at 14,)

26, which represent units of measure.

adjusting-lever 27 is mounted on the rock 85 which are of the usual construction. The said rock-shaft comprises two sections 9 9", which are connected together by a coupling 9C, which comprises a pair of disks keyed to 55 'the respective sections of the rock-shaft and bolted'together,asshown. Thecouplingmay be otherwise constructed, if preferred. The casing 12 is of segmental form, and in the same is an oscillating head or piston 1G, which is 6o keyed to the rock-shaft and is provided with suitable spring-pressed packing-strips 17. The said casing 12 is provided with channels 18 to admit iiuid under pressure to and from the interior of the casing at points representing the limits of the` strokes of the oscillating piston, and said easing is further provided with an exhaustport 19. The channels 18 are alternately uncovered by a valve 2O in a chest 21, to which steam or other suit- 7o;

able fluid under pressure is admitted through a suitable pipe, as at 22. operatin g-rod 23, which is manually operated,

and it willqbe understood from the-foregoing that the shaft 9 may be rocked by operating 75 the valve 2O in such manner as to apply iluid.

pressure to opposite sides of the oscillatin piston 16 alternately.

An adjusting-arm 24-is keyed on the rockshaft, near one end thereof, and operates on 8c one side of an adj usting-segment 25, which in the embodiment of my invention here shown is provided with a series Aof peripheral teeth An shaft 9, so that it may be turned independ-V ently of the said rock-shaft. lever is bifurcated at its inner end and dis posed asti-ide of the adjusting-segmentand is provided with a spring-pressed adjusting 9o segment and forms one stop for the adjusting-arm 24 to limit the movement of the latter, and hence of the rock-shaft, in one direction, the movement of said lever and said rock-shaft. in the reverse direction being lim.-

The valve 2O has an` l Said adjustingited by the adjusting-haver 27, which forms a rco stop for said adjusting-arm'.

It will be understood from the foregoing that the roeleshatt maybe caused to move as far at each stroke ofl the piston 16 as may be requisite to adjust the knees on the headblocks to the desired extent. Any suitable means may be employed for communicating power'from the rockshaft'to the set-shaft 8. In the embodiment of my invention here shown the set-shaft 8 is provided with a' ratchet-wheel 37, which is engaged by a pawl 30, operated byan eccentric 3l,which is keyed on the rock-shaft.

It is desirable to provide means for cushtoning the iluid-pressure-actuated mechanism, which operates the rock-shatt, in order to keep the set-works from being unduly jarred thereby, and to this end I provide a piston 32, which is keyed to the rock-shaft and operates in the segmental-sl1aped casing 13, between the shoulders thereof. The said casing is filled with oil or other suitable duid and is provided with a channel 34, of suitable capacity, which conducts the oil from one side ot the piston to the other side thereof at each stroke of the piston, which is occasioned by the operation of the rock-shaf t, and in this channel is a valve or coclr 35, by means of which said channel may be closed or partlyclosed to any desired extent. The body of oil or other fluid in the cushioningcasing must be displaced at each stroke of the piston and caused to pass from one side of the piston to the other. It will'be understood thatthe oil tends to retard the movement of the piston and by being compressed between the latter and the eoacting shoulders of the cushioning-easing prevents concussion between the piston 16 and the coacting shoulders of the casing 12.' i

In. the event that the iuid-pressure-actuated mechanism should get outof Working order the rocleshaft may be Operated manually by the lever 27, which in this event coacts with the adjusting-arm 24 to operate the rockshati. /Vhen thus manually operated, it is desirable to connect the lever 27 to the adjusting-arm 24, as by a bolt 36, Which is indicated in dotted lines in Fig. 5. 'When the rockshaft is thus operated manually, the sections of the rock-shaft are uncouplcd, as will be understood. The adjusting-13011329 enables the stroke of the arm 251, 'and hence of the rock-shaft, to be predetermined with great nieety in order that the knees may be adjusted on the head-block exactly as may be required tocause the lumber to be sawed of the desired thickness.

Having thusdescribed my invention, I claim- 1. In sawmill set-works, the combination with knees andmeans to adjust them, of a rock-shaftoonnected to and actuating said 'knee-adjusting means, a rockarm"on said roclcshaft, means tooscillate said rock-shaft and thereby actuate said knee-adjusting means, a set-lever and locking-arc therefor, a stop to limit t--he strokes of therock-shaft, and means to detach ably secure said set-lever to said rock-arm and thereby adapt therockshaft to be manually operated, substantially as described.

2. In sawmill set-works, the combination with knees and means to adjust them, of a rock-shaft connected to and actuating said knee-adjusting means and having a rock-arm, and an oscillating piston, a casing in which said -piston oscillates, means to apply duidpressure alternately to opposite sides of said piston, a 'set-lever and an adjustable stop, said set-lever and stop coacting with said rockarm to limit the strokes of the rock-shaft, and

means to secure said set-lever to said rockarm and thereby adapt the rockshaftito be manually operated, substantially as described.

5. In sawmill setworks, in combination with knees and means to adjust them, alrockshaft in two sections and having a coupling to secure said sections together and detach them at will, a fluid-pressure mechanism operative on one of said sections, to rock said shaft, a hand-lever pivoted on the other section, the latter also having a rock-arm fast therewith, a st0p, ,coacting with said hand-- lever, to limit the strokes of the rock-arm and thereby limit the strokes of the'rock-shat't, means to secure said hand-lever to said rockarm, for the purpose set forth, 'and connections between said rock-shaft and the means for adjusting the knees, substantially as described.

4. In sawmill set-works, in combination with knees and means to adjust them, a rockshaft in two sections and having a coupling to secure said sections together and detach them at will, a power mechanism operating on one et said sections to rock said shaft, a rock-arm -fast Withthe other section of said rock-shaft, a hand-lever, alocking-arc therefor, means to detachably connect said lever with said rock-arm, a stop to limit the strokes ot the rock-shaft, and connections between said rock-shaft and the means for adjusting the knees, substantially as described.

In testimony that I claim the foregoing as my own I havehereto 'affixed my signature in. the presence ot two witnesses.

. MOSESl F. JOHNSTON. Vitnesses: l

v RALPH E. GEIsLER,

WILLlAM R. GoDsHALL.

IIC 

